/*
 * Copyright (C) 2010 Google Inc. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1.  Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 * 2.  Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
 *     its contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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#ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_SOURCE_PROVIDER_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_SOURCE_PROVIDER_H_

#include <cstddef>
#include "third_party/blink/renderer/platform/wtf/allocator/allocator.h"

namespace blink {

class AudioBus;
class AudioSourceProviderClient;

// Abstract base-class for a pull-model client.
class AudioSourceProvider {
  USING_FAST_MALLOC(AudioSourceProvider);

 public:
  AudioSourceProvider() = default;
  AudioSourceProvider(const AudioSourceProvider&) = delete;
  AudioSourceProvider& operator=(const AudioSourceProvider&) = delete;

  // provideInput() gets called repeatedly to render time-slices of a continuous
  // audio stream.
  virtual void ProvideInput(AudioBus* bus, int frames_to_process) = 0;

  // If a client is set, we call it back when the audio format is available or
  // changes.
  virtual void SetClient(AudioSourceProviderClient*) {}

  virtual ~AudioSourceProvider() = default;
};

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_AUDIO_AUDIO_SOURCE_PROVIDER_H_
